Use 'Multi Signal Plot Overlaid' as you've done already; in the properties, the signals need to be overlaid. You may group by signal e.g. FID Front signal/ FID Back signal or, if you want to overlay all signals, not have them grouped.

I did this below for two DAD signals rather than FID but the principle is the same. If you don't want everything overlaid, you would need to filter your signals in the reporting properties.